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• How can I get Python to find ffprobe ?

  23 décembre 2016, par Gloin

  I have ffmpeg and ffprobe installed on my mac (macOS Sierra), and I have added their path to PATH. I can run them from terminal.

  I am trying to use ffprobe to get the width and height of a video file using the following code :

  import subprocess
  
  import shlex
  
  import json
  
  
  
  
  
  # function to find the resolution of the input video file
  
  def findVideoResolution(pathToInputVideo):
  
      cmd = "ffprobe -v quiet -print_format json -show_streams"
  
      args = shlex.split(cmd)
  
      args.append(pathToInputVideo)
  
      # run the ffprobe process, decode stdout into utf-8 & convert to JSON
  
      ffprobeOutput = subprocess.check_output(args).decode('utf-8')
  
      ffprobeOutput = json.loads(ffprobeOutput)
  
  
  
      # find height and width
  
      height = ffprobeOutput['streams'][0]['height']
  
      width = ffprobeOutput['streams'][0]['width']
  
  
  
      return height, width
  
  
  
  h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
  
  print(h, w)

  I am sorry I cannot provide a MCVE, as I didn’t write this code, and I don’t really know how it works.

  It gives the following error :

  Traceback (most recent call last):
  
    File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 21, in <module>
  
      h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
  
    File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 12, in findVideoResolution
  
      ffprobeOutput = subprocess.check_output(args).decode('utf-8')
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 626, in check_output
  
      **kwargs).stdout
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 693, in run
  
      with Popen(*popenargs, **kwargs) as process:
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 947, in __init__
  
      restore_signals, start_new_session)
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 1551, in _execute_child
  
      raise child_exception_type(errno_num, err_msg)
  
  FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe'
  
  </module>

  If python is not reading from the PATH file, how can I specify where ffprobe is ?

  EDIT :
  It appears the python path is not aligned with my shell path.
  Using os.environ["PATH"]+=":/the_path/of/ffprobe/dir" at the beginning of each program allows me to use ffprobe, but why might my python path not be the same as my shell path ?

• Didn't find class "org.bytedeco.javacpp.avutil" in JAVACV version 1.2 on Android

  26 juillet 2016, par Eloy Palao

  I read a lot of answers but i can’t resolve my bug. The error is :

  java.lang.NoClassDefFoundError: java.lang.ClassNotFoundException: org.bytedeco.javacpp.avutil
  
                                                                         at org.bytedeco.javacpp.Loader.load(Loader.java:469)
  
                                                                         at org.bytedeco.javacpp.Loader.load(Loader.java:409)
  
                                                                         at org.bytedeco.javacpp.avcodec$AVPacket.<clinit>(avcodec.java:1559)
  
                                                                         at org.bytedeco.javacv.FFmpegFrameRecorder.<init>(FFmpegFrameRecorder.java:149)
  
                                                                         at org.bytedeco.javacv.FFmpegFrameRecorder.<init>(FFmpegFrameRecorder.java:126)
  
  </init></init></clinit>

  To configure JAVACV, I only put some lines in the gradle, but i don’t know if i have to do something more to configure it. I read about jniLibs folder, but this grade lines do not generate any folders. Also I read about compileSDKVersion 22 but I did it and do not resolve the problem.

  Please I need help, because I read a lot of post and bugs but any of them resolve me the problem.

      apply plugin: 'com.android.application'
  
  
  
  android {
  
      compileSdkVersion 23
  
      buildToolsVersion '23.0.3'
  
  
  
      defaultConfig {
  
          applicationId "com.eloyfranapps.daym"
  
          minSdkVersion 15
  
          targetSdkVersion 23
  
          versionCode 1
  
          versionName "1.0"
  
      }
  
      buildTypes {
  
          release {
  
              minifyEnabled false
  
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
  
          }
  
      }
  
  
  
      packagingOptions {
  
          exclude 'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.properties'
  
          exclude 'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.xml'
  
          exclude 'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.properties'
  
          exclude 'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.xml'
  
      }
  
  }
  
  
  
  configurations {
  
      all*.exclude group: 'org.bytedeco', module: 'javacpp-presets'
  
  }
  
  
  
  dependencies {
  
      compile fileTree(include: ['*.jar'], dir: 'libs')
  
      testCompile 'junit:junit:4.12'
  
      compile 'com.android.support:appcompat-v7:23.0.0'
  
      compile 'com.android.support:design:23.0.0'
  
      compile 'it.neokree:MaterialTabs:0.11'
  
      compile group: 'org.bytedeco', name: 'javacv', version: '1.2'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'opencv', version: '3.1.0-1.2', classifier: 'android-arm'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'opencv', version: '3.1.0-1.2', classifier: 'android-x86'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'ffmpeg', version: '3.0.2-1.2', classifier: 'android-arm'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'ffmpeg', version: '3.0.2-1.2', classifier: 'android-x86'
  
  }

  and the error is in the first line "new FFmpegFrameRecorder(outputPath, 1080, 1080) ;" of my code :

  FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputPath, 1080, 1080);
  
  
  
              recorder.setVideoQuality(12.5);
  
              recorder.setVideoCodec(13);
  
              recorder.setFormat("mp4");
  
              recorder.setFrameRate(fps);
  
              recorder.start();
  
              AndroidFrameConverter an = new AndroidFrameConverter();
  
              for (int i = 0; i < charFrames.size(); i++) {
  
                  Frame frame = an.convert(charFrames.get(i));
  
                  recorder.record(frame);
  
              }
  
              recorder.stop();

• How can i use ffmpeg.exe command line to create a video file from number of images on hard disk ?

  22 juillet 2016, par TheLost Lostit

  In command prompt window i typed in the directory of the images :

  D :\SavedScreenshots>ffmpeg.exe -r 3 -i Imgp%04d.bmp -s 720x480 test.avi

  The images file are Bmp type.
  The first image file name is : screenshot0.bmp
  The last one is : screenshot168.bmp

  Example of one image details : Width 1920 Height 1080 Bit Depth 32

  The ffmpeg.exe file is in the same directory of the images.

  In the prompt windows console ouput i see :

  [image2 @ 00000000025624a0] Could find no file with path ’Imgp%04d.bmp’ and index in the range 0-4
  Imgp%04d.bmp : No such file or directory

  Then how should i do it the command line ?

  I found the problem and now it’s working but it’s very strange.

  In c# i create the screenshots of my desktop this images on the hard disk i want to create video file from.
  In c# i did in a timer tick event :

  int count = 0;
  
          private void timer1_Tick(object sender, EventArgs e)
  
          {
  
              Bitmap bmp = new Bitmap(sc.CaptureScreen());
  
              bmp.Save(@"D:\SavedScreenshots\screenshot" + count + ".bmp");
  
              bmp.Dispose();
  
              count ++;
  
          }

  This saved the images on the hard disk all of them in sizes between 129-132kb each file. I could edit/open the images and see them no problems but ffmpeg could not handle them gave me this error.

  Now i changed the code in the c# to this :

  bmp.Save(@"D:\SavedScreenshots\screenshot" + count + ".bmp", System.Drawing.Imaging.ImageFormat.Bmp);

  I added the part : System.Drawing.Imaging.ImageFormat.Bmp

  Now each image file it’s size is about 7MB !!!!
  And now ffmpeg can handle it with the command line :

  ffmpeg.exe -framerate 3 -i screenshot%d.bmp -vf scale=ntsc,setdar=16/9 test.avi

  I wonder why when the images size was 130KB ffmpeg couldn not handle it didn’t find the files or directory and when they are 7MB it does find and create the video file ?

  Even now when i type as command line :

  ffmpeg  -i screenshot%03.bmp -s 720x480 test.avi

  I’m getting erorr not such file or directory

  Only when i type :

  ffmpeg  -i screenshot%d.bmp -s 720x480 test.avi

  It’s working.

  Why when doing screenshot%3.bmp it’s not working but screenshot%d.bmp does working ?

  Also doing screenshot0.bmp worked. Only screenshot%3.bmp not working.
  And in all examples i saw i had to make screenshot%3 or %2 but they give me the error no such directory file.